Speaker
Description
Sudden Commencements (SCs) are rapid, near-impulsive changes of the geomagnetic field that are measured on the ground. SCs are caused by sudden increases of solar wind dynamic pressure (e.g., interplanetary shocks), that compress the Earth’s geomagnetic cavity (the magnetosphere). Such changes in the geomagnetic field, as measured on the surface of the Earth, result in the creation of geoelectric fields in the solid Earth and consequently Geomagnetically Induced Currents in grounded, conducting infrastructure. When large, these GICs present a hazard to the continuous, safe operation of infrastructure such as power networks - we must be able to accurately predict their magnitude.
The links between the properties of the incident solar wind structure, the observed magnetic field signature at a given location and the resulting GIC are complex. In this work we explore the correspondence between these factors, introducing an analytical model to mimic the physical origin of each constituent component of the ground magnetic field signature. We explore how the each component varies across the globe, and attempt to link these underlying properties to the causal solar wind structure. We test how different types of SC magnetic signature translate to GIC within a well-documented example power network using synthetic tests and numerical models. This ultimately allows us key insights into the types of solar wind structure that will be most “geoeffective” at a given location.
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